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/*

 * Netlink event notifications for SELinux.

 *

 * Author: James Morris <jmorris@redhat.com>

 *

 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2,

 * as published by the Free Software Foundation.

 */

#include <linux/init.h>

#include <linux/types.h>

#include <linux/stddef.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/skbuff.h>

#include <linux/netlink.h>

#include <linux/selinux_netlink.h>

#include <net/net_namespace.h>

static struct sock *selnl;

static int selnl_msglen(int msgtype)

{

        int ret = 0;

        switch (msgtype) {

        case SELNL_MSG_SETENFORCE:

                ret = sizeof(struct selnl_msg_setenforce);

                break;

        case SELNL_MSG_POLICYLOAD:

                ret = sizeof(struct selnl_msg_policyload);

                break;

        default:

                BUG();

        }

        return ret;

}

static void selnl_add_payload(struct nlmsghdr *nlh, int len, int msgtype, void *data)

{

        switch (msgtype) {

        case SELNL_MSG_SETENFORCE: {

                struct selnl_msg_setenforce *msg = NLMSG_DATA(nlh);

                memset(msg, 0, len);

                msg->val = *((int *)data);

                break;

        }

        case SELNL_MSG_POLICYLOAD: {

                struct selnl_msg_policyload *msg = NLMSG_DATA(nlh);

                memset(msg, 0, len);

                msg->seqno = *((u32 *)data);

                break;

        }

        default:

                BUG();

        }

}

static void selnl_notify(int msgtype, void *data)

{

        int len;

        sk_buff_data_t tmp;

        struct sk_buff *skb;

        struct nlmsghdr *nlh;

        len = selnl_msglen(msgtype);

        skb = alloc_skb(NLMSG_SPACE(len), GFP_USER);

        if (!skb)

                goto oom;

        tmp = skb->tail;

        nlh = NLMSG_PUT(skb, 0, 0, msgtype, len);

        selnl_add_payload(nlh, len, msgtype, data);

        nlh->nlmsg_len = skb->tail - tmp;

        NETLINK_CB(skb).dst_group = SELNLGRP_AVC;

        netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER);

out:

        return;

nlmsg_failure:

        kfree_skb(skb);

oom:

        printk(KERN_ERR "SELinux:  OOM in %s\n", __FUNCTION__);

        goto out;

}

void selnl_notify_setenforce(int val)

{

        selnl_notify(SELNL_MSG_SETENFORCE, &val);

}

void selnl_notify_policyload(u32 seqno)

{

        selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);

}

static int __init selnl_init(void)

{

        selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX,

                                      SELNLGRP_MAX, NULL, NULL, THIS_MODULE);

        if (selnl == NULL)

                panic("SELinux:  Cannot create netlink socket.");

        netlink_set_nonroot(NETLINK_SELINUX, NL_NONROOT_RECV);

        return 0;

}

__initcall(selnl_init);